:root {
    --bg-main: #020712;
    --bg-sec: #050d1c;
    --accent: #2fd5ff;     /* ฟ้าใสน้ำสะอาด */
    --accent2: #35f0b6;    /* เขียวอมฟ้า */
    --card: rgba(7, 15, 30, 0.97);
    --stroke: rgba(255,255,255,0.06);
    --txt: #eaf6ff;
    --muted: #a8b7cc;
}

/* ===== shell ทั้งหน้า ===== */
.auth-shell {
    min-height: 100vh;
    margin: 0;
    padding: 0;
    color: var(--txt);
    font-family: 'Noto Sans Thai', sans-serif;
    -moz-osx-font-smoothing: grayscale;
    line-height: 1.3;
    /* abstract น้ำสะอาด */
    background: radial-gradient(circle at 15% 15%, rgba(47,213,255,0.25), transparent 55%), radial-gradient(circle at 85% 80%, rgba(53,240,182,0.20), transparent 50%), radial-gradient(circle at 10% 90%, rgba(255,255,255,0.05), transparent 40%), linear-gradient(135deg, #020712, #050d1c 55%, #03101a);
    background-size: cover;
    background-attachment: fixed;
}

@supports (-webkit-touch-callout: none) {
    /* iOS ชอบจุกกับ fixed */
    .auth-shell {
        background-attachment: scroll;
    }
}

/* overlay กลางจอ */
.auth-shell__overlay {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px 16px;
    backdrop-filter: blur(6px);
}

/* card login */
.auth-shell__card {
    width: 100%;
    max-width: 430px;
    padding: 26px 22px 22px;
    border-radius: 20px;
    background:
        linear-gradient(145deg,
            rgba(8, 16, 32, 0.98),
            rgba(4, 13, 24, 0.98)
        );
    border: 1px solid var(--stroke);
    box-shadow:
        0 22px 70px rgba(0, 0, 0, 0.85),
        0 0 0 1px rgba(255,255,255,0.02);
    position: relative;
    overflow: hidden;
}

/* ตกแต่งแสงด้านหลัง card */
.auth-shell__card::before {
    content: "";
    position: absolute;
    inset: -40%;
    background:
        radial-gradient(circle at 10% 0%, rgba(47,213,255,0.10), transparent 55%),
        radial-gradient(circle at 100% 100%, rgba(53,240,182,0.18), transparent 45%);
    opacity: 0.9;
    pointer-events: none;
    z-index: -1;
}

/* แถบ pill ด้านบน */
.auth-card__pill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 4px 12px 4px 8px;
    border-radius: 999px;
    border: 1px solid rgba(47,213,255,0.55);
    background: linear-gradient(90deg,
        rgba(47,213,255,0.20),
        rgba(53,240,182,0.05));
    font-size: 0.72rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--muted);
}

.auth-card__pill .dot {
    width: 8px;
    height: 8px;
    border-radius: 999px;
    background: radial-gradient(circle, var(--accent2), var(--accent));
    box-shadow: 0 0 10px rgba(47,213,255,0.9);
}

.auth-card__pill .txt {
    transform: translateY(0.5px);
}

/* โลโก้เล็ก ๆ */
.auth-logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    position: relative;
}

.auth-logo .bubble {
    border-radius: 999px;
    background: radial-gradient(circle at 30% 20%, #fff, var(--accent));
    opacity: 0.85;
    filter: drop-shadow(0 0 18px rgba(47,213,255,0.9));
}

.auth-logo .bubble-lg {
    width: 24px;
    height: 24px;
}

.auth-logo .bubble-sm {
    width: 10px;
    height: 10px;
    opacity: 0.7;
}

.auth-logo .label {
    font-weight: 700;
    letter-spacing: 0.14em;
    font-size: 0.82rem;
}

/* form layout */
.auth-shell__card .form-label {
    color: var(--muted);
}

.auth-shell__card .form-control {
    background-color: rgba(3, 10, 22, 0.95);
    border-radius: 14px;
    border: 1px solid rgba(255,255,255,0.10);
    color: var(--txt);
    padding-block: 0.6rem;
    font-size: 0.95rem;
}

.auth-shell__card .form-control::placeholder {
    color: rgba(180, 195, 215, 0.65);
}

.auth-shell__card .form-control:focus {
    border-color: var(--accent);
    outline: none;
    box-shadow:
        0 0 0 1px rgba(47,213,255,0.6),
        0 0 14px rgba(47,213,255,0.35);
    background-color: rgba(3, 11, 23, 0.98);
}

.form-check-input {
    background-color: rgba(2, 8, 18, 0.9);
    border-color: rgba(255,255,255,0.25);
}

.form-check-input:checked {
    background-color: var(--accent);
    border-color: var(--accent);
}

/* ปุ่มหลัก */
.auth-btn-main {
    border-radius: 999px;
    border: none;
    background-image: linear-gradient(135deg, var(--accent), var(--accent2));
    font-weight: 600;
    box-shadow: 0 12px 30px rgba(0,0,0,0.7);
}

.auth-btn-main:active {
    transform: translateY(1px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.8);
}

/* ลิงก์เบา ๆ */
.link-soft {
    color: var(--accent);
}

.link-soft:hover {
    color: var(--accent2);
}

/* footer ล่าง card */
.auth-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid rgba(255,255,255,0.06);
    padding-top: 10px;
    margin-top: 8px;
}

.auth-footer .left,
.auth-footer .right {
    font-size: 0.72rem;
    color: var(--muted);
}

/* ===== responsive ===== */
@media (min-width: 992px) {
    .auth-shell__card {
        padding: 32px 26px 24px;
        max-width: 460px;
    }
}

@media (max-width: 400px) {
    .auth-shell__card {
        padding: 22px 16px 18px;
        border-radius: 18px;
    }
    .auth-footer {
        flex-direction: column;
        gap: 4px;
        align-items: flex-start;
    }
}